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Type: Journal article
Title: Sandwich-like nitrogen-doped porous carbon/graphene nanoflakes with high-rate capacitive performance
Author: Zhang, Y.
Tao, B.
Xing, W.
Zhang, L.
Xue, Q.
Yan, Z.
Citation: Nanoscale, 2016; 8(15):7889-7898
Publisher: Royal Society of Chemistry
Issue Date: 2016
ISSN: 2040-3364
Statement of
Yu Zhang, Binglin Tao, Wei Xing, Lei Zhang, Qingzhong Xue and Zifeng Yan
Abstract: Sandwich-like nitrogen-doped porous carbon/graphene nanoflakes (NPCFs) are prepared via a two-step approach, firstly by using in situ polymerization of pyrrole (Py) on the surface of graphene oxide (GO) and then by KOH activation under an Ar atmosphere. As the shape-directing agent and conductive matrix, graphene sheets play an important role in enhancing NPCFs' electrochemical performance. The NPCFs exhibit high specific surface area (2502 m² g⁻¹), short ion diffusion path (ca. 30 nm), high conductivity (72 S m⁻¹) and a considerable nitrogen level (6.3 wt%). These intriguing features render NPCFs a promising electrode material for electrochemical supercapacitors, which displays high specific capacitance (341 F g⁻¹), excellent rate capability (over 71% retention ratio at 50 A g⁻¹) and outstanding cycling stability (almost no capacitance loss after 2000 cycles) in a 30 wt% KOH aqueous electrolyte. Besides, the assembled symmetrical supercapacitor delivers a high gravimetric energy density of 11.3 Wh kg⁻¹ in an aqueous electrolyte and 66.4 Wh kg⁻¹ in an organic electrolyte.
Rights: This journal is © The Royal Society of Chemistry 2016
RMID: 0030040871
DOI: 10.1039/c5nr05151g
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Appears in Collections:Chemical Engineering publications

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